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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _SCSI_GENERIC_H |
3 | #define _SCSI_GENERIC_H | |
4 | ||
5 | #include <linux/compiler.h> | |
6 | ||
7 | /* | |
65c26a0f DG |
8 | * History: |
9 | * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), to allow user | |
10 | * process control of SCSI devices. | |
11 | * Development Sponsored by Killy Corp. NY NY | |
12 | * | |
13 | * Original driver (sg.h): | |
14 | * Copyright (C) 1992 Lawrence Foard | |
15 | * Version 2 and 3 extensions to driver: | |
16 | * Copyright (C) 1998 - 2014 Douglas Gilbert | |
17 | * | |
18 | * Version: 3.5.36 (20140603) | |
19 | * This version is for 2.6 and 3 series kernels. | |
20 | * | |
21 | * Documentation | |
22 | * ============= | |
23 | * A web site for the SG device driver can be found at: | |
24 | * http://sg.danny.cz/sg [alternatively check the MAINTAINERS file] | |
25 | * The documentation for the sg version 3 driver can be found at: | |
26 | * http://sg.danny.cz/sg/p/sg_v3_ho.html | |
d4d79340 | 27 | * Also see: <kernel_source>/Documentation/scsi/scsi-generic.rst |
65c26a0f DG |
28 | * |
29 | * For utility and test programs see: http://sg.danny.cz/sg/sg3_utils.html | |
30 | */ | |
1da177e4 | 31 | |
15485a46 DY |
32 | #ifdef __KERNEL__ |
33 | extern int sg_big_buff; /* for sysctl */ | |
34 | #endif | |
1da177e4 | 35 | |
1da177e4 LT |
36 | |
37 | typedef struct sg_iovec /* same structure as used by readv() Linux system */ | |
38 | { /* call. It defines one scatter-gather element. */ | |
39 | void __user *iov_base; /* Starting address */ | |
40 | size_t iov_len; /* Length in bytes */ | |
41 | } sg_iovec_t; | |
42 | ||
43 | ||
44 | typedef struct sg_io_hdr | |
45 | { | |
46 | int interface_id; /* [i] 'S' for SCSI generic (required) */ | |
47 | int dxfer_direction; /* [i] data transfer direction */ | |
65c26a0f | 48 | unsigned char cmd_len; /* [i] SCSI command length */ |
1da177e4 LT |
49 | unsigned char mx_sb_len; /* [i] max length to write to sbp */ |
50 | unsigned short iovec_count; /* [i] 0 implies no scatter gather */ | |
51 | unsigned int dxfer_len; /* [i] byte count of data transfer */ | |
52 | void __user *dxferp; /* [i], [*io] points to data transfer memory | |
53 | or scatter gather list */ | |
54 | unsigned char __user *cmdp; /* [i], [*i] points to command to perform */ | |
55 | void __user *sbp; /* [i], [*o] points to sense_buffer memory */ | |
56 | unsigned int timeout; /* [i] MAX_UINT->no timeout (unit: millisec) */ | |
57 | unsigned int flags; /* [i] 0 -> default, see SG_FLAG... */ | |
58 | int pack_id; /* [i->o] unused internally (normally) */ | |
59 | void __user * usr_ptr; /* [i->o] unused internally */ | |
60 | unsigned char status; /* [o] scsi status */ | |
61 | unsigned char masked_status;/* [o] shifted, masked scsi status */ | |
62 | unsigned char msg_status; /* [o] messaging level data (optional) */ | |
63 | unsigned char sb_len_wr; /* [o] byte count actually written to sbp */ | |
64 | unsigned short host_status; /* [o] errors from host adapter */ | |
65 | unsigned short driver_status;/* [o] errors from software driver */ | |
66 | int resid; /* [o] dxfer_len - actual_transferred */ | |
67 | unsigned int duration; /* [o] time taken by cmd (unit: millisec) */ | |
68 | unsigned int info; /* [o] auxiliary information */ | |
69 | } sg_io_hdr_t; /* 64 bytes long (on i386) */ | |
70 | ||
78ed001d AB |
71 | #if defined(__KERNEL__) |
72 | #include <linux/compat.h> | |
73 | ||
74 | struct compat_sg_io_hdr { | |
75 | compat_int_t interface_id; /* [i] 'S' for SCSI generic (required) */ | |
76 | compat_int_t dxfer_direction; /* [i] data transfer direction */ | |
77 | unsigned char cmd_len; /* [i] SCSI command length ( <= 16 bytes) */ | |
78 | unsigned char mx_sb_len; /* [i] max length to write to sbp */ | |
79 | unsigned short iovec_count; /* [i] 0 implies no scatter gather */ | |
80 | compat_uint_t dxfer_len; /* [i] byte count of data transfer */ | |
81 | compat_uint_t dxferp; /* [i], [*io] points to data transfer memory | |
82 | or scatter gather list */ | |
83 | compat_uptr_t cmdp; /* [i], [*i] points to command to perform */ | |
84 | compat_uptr_t sbp; /* [i], [*o] points to sense_buffer memory */ | |
85 | compat_uint_t timeout; /* [i] MAX_UINT->no timeout (unit: millisec) */ | |
86 | compat_uint_t flags; /* [i] 0 -> default, see SG_FLAG... */ | |
87 | compat_int_t pack_id; /* [i->o] unused internally (normally) */ | |
88 | compat_uptr_t usr_ptr; /* [i->o] unused internally */ | |
89 | unsigned char status; /* [o] scsi status */ | |
90 | unsigned char masked_status; /* [o] shifted, masked scsi status */ | |
91 | unsigned char msg_status; /* [o] messaging level data (optional) */ | |
92 | unsigned char sb_len_wr; /* [o] byte count actually written to sbp */ | |
93 | unsigned short host_status; /* [o] errors from host adapter */ | |
94 | unsigned short driver_status; /* [o] errors from software driver */ | |
95 | compat_int_t resid; /* [o] dxfer_len - actual_transferred */ | |
96 | compat_uint_t duration; /* [o] time taken by cmd (unit: millisec) */ | |
97 | compat_uint_t info; /* [o] auxiliary information */ | |
98 | }; | |
99 | #endif | |
100 | ||
1da177e4 LT |
101 | #define SG_INTERFACE_ID_ORIG 'S' |
102 | ||
103 | /* Use negative values to flag difference from original sg_header structure */ | |
104 | #define SG_DXFER_NONE (-1) /* e.g. a SCSI Test Unit Ready command */ | |
105 | #define SG_DXFER_TO_DEV (-2) /* e.g. a SCSI WRITE command */ | |
106 | #define SG_DXFER_FROM_DEV (-3) /* e.g. a SCSI READ command */ | |
107 | #define SG_DXFER_TO_FROM_DEV (-4) /* treated like SG_DXFER_FROM_DEV with the | |
108 | additional property than during indirect | |
109 | IO the user buffer is copied into the | |
110 | kernel buffers before the transfer */ | |
111 | #define SG_DXFER_UNKNOWN (-5) /* Unknown data direction */ | |
112 | ||
113 | /* following flag values can be "or"-ed together */ | |
114 | #define SG_FLAG_DIRECT_IO 1 /* default is indirect IO */ | |
115 | #define SG_FLAG_UNUSED_LUN_INHIBIT 2 /* default is overwrite lun in SCSI */ | |
116 | /* command block (when <= SCSI_2) */ | |
117 | #define SG_FLAG_MMAP_IO 4 /* request memory mapped IO */ | |
118 | #define SG_FLAG_NO_DXFER 0x10000 /* no transfer of kernel buffers to/from */ | |
119 | /* user space (debug indirect IO) */ | |
d1515613 DG |
120 | /* defaults:: for sg driver: Q_AT_HEAD; for block layer: Q_AT_TAIL */ |
121 | #define SG_FLAG_Q_AT_TAIL 0x10 | |
122 | #define SG_FLAG_Q_AT_HEAD 0x20 | |
1da177e4 LT |
123 | |
124 | /* following 'info' values are "or"-ed together */ | |
125 | #define SG_INFO_OK_MASK 0x1 | |
126 | #define SG_INFO_OK 0x0 /* no sense, host nor driver "noise" */ | |
127 | #define SG_INFO_CHECK 0x1 /* something abnormal happened */ | |
128 | ||
129 | #define SG_INFO_DIRECT_IO_MASK 0x6 | |
130 | #define SG_INFO_INDIRECT_IO 0x0 /* data xfer via kernel buffers (or no xfer) */ | |
131 | #define SG_INFO_DIRECT_IO 0x2 /* direct IO requested and performed */ | |
132 | #define SG_INFO_MIXED_IO 0x4 /* part direct, part indirect IO */ | |
133 | ||
464a00c9 HR |
134 | /* |
135 | * Obsolete DRIVER_SENSE driver byte | |
136 | * | |
137 | * Originally the SCSI midlayer would set the DRIVER_SENSE driver byte when | |
138 | * a sense code was generated and a sense buffer was allocated. | |
139 | * However, as nowadays every scsi command has a sense code allocated this | |
140 | * distinction became moot as one could check the sense buffer directly. | |
141 | * Consequently this byte is not set anymore from the midlayer, but SG will | |
142 | * keep setting this byte to be compatible with previous releases. | |
143 | */ | |
144 | #define DRIVER_SENSE 0x08 | |
54c29086 HR |
145 | /* Obsolete driver_byte() declaration */ |
146 | #define driver_byte(result) (((result) >> 24) & 0xff) | |
1da177e4 | 147 | |
3d45cefc HR |
148 | /* |
149 | * Original linux SCSI Status codes. They are shifted 1 bit right | |
150 | * from those found in the SCSI standards. | |
151 | */ | |
152 | ||
153 | #define GOOD 0x00 | |
154 | #define CHECK_CONDITION 0x01 | |
155 | #define CONDITION_GOOD 0x02 | |
156 | #define BUSY 0x04 | |
157 | #define INTERMEDIATE_GOOD 0x08 | |
158 | #define INTERMEDIATE_C_GOOD 0x0a | |
159 | #define RESERVATION_CONFLICT 0x0c | |
160 | #define COMMAND_TERMINATED 0x11 | |
161 | #define QUEUE_FULL 0x14 | |
162 | #define ACA_ACTIVE 0x18 | |
163 | #define TASK_ABORTED 0x20 | |
164 | ||
165 | /* Obsolete status_byte() declaration */ | |
166 | #define status_byte(result) (((result) >> 1) & 0x7f) | |
167 | ||
1da177e4 LT |
168 | typedef struct sg_scsi_id { /* used by SG_GET_SCSI_ID ioctl() */ |
169 | int host_no; /* as in "scsi<n>" where 'n' is one of 0, 1, 2 etc */ | |
170 | int channel; | |
171 | int scsi_id; /* scsi id of target device */ | |
172 | int lun; | |
173 | int scsi_type; /* TYPE_... defined in scsi/scsi.h */ | |
174 | short h_cmd_per_lun;/* host (adapter) maximum commands per lun */ | |
175 | short d_queue_depth;/* device (or adapter) maximum queue length */ | |
176 | int unused[2]; /* probably find a good use, set 0 for now */ | |
177 | } sg_scsi_id_t; /* 32 bytes long on i386 */ | |
178 | ||
179 | typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ | |
180 | char req_state; /* 0 -> not used, 1 -> written, 2 -> ready to read */ | |
40d6b939 | 181 | char orphan; /* 0 -> normal request, 1 -> from interrupted SG_IO */ |
1da177e4 LT |
182 | char sg_io_owned; /* 0 -> complete with read(), 1 -> owned by SG_IO */ |
183 | char problem; /* 0 -> no problem detected, 1 -> error to report */ | |
184 | int pack_id; /* pack_id associated with request */ | |
185 | void __user *usr_ptr; /* user provided pointer (in new interface) */ | |
186 | unsigned int duration; /* millisecs elapsed since written (req_state==1) | |
187 | or request duration (req_state==2) */ | |
188 | int unused; | |
189 | } sg_req_info_t; /* 20 bytes long on i386 */ | |
190 | ||
191 | ||
192 | /* IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow. | |
193 | [Those that only apply to the SG 2.x drivers are at the end of the file.] | |
194 | (_GET_s yield result via 'int *' 3rd argument unless otherwise indicated) */ | |
195 | ||
196 | #define SG_EMULATED_HOST 0x2203 /* true for emulated host adapter (ATAPI) */ | |
197 | ||
198 | /* Used to configure SCSI command transformation layer for ATAPI devices */ | |
199 | /* Only supported by the ide-scsi driver */ | |
200 | #define SG_SET_TRANSFORM 0x2204 /* N.B. 3rd arg is not pointer but value: */ | |
201 | /* 3rd arg = 0 to disable transform, 1 to enable it */ | |
202 | #define SG_GET_TRANSFORM 0x2205 | |
203 | ||
204 | #define SG_SET_RESERVED_SIZE 0x2275 /* request a new reserved buffer size */ | |
205 | #define SG_GET_RESERVED_SIZE 0x2272 /* actual size of reserved buffer */ | |
206 | ||
207 | /* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */ | |
208 | #define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */ | |
209 | /* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */ | |
210 | ||
211 | /* Override host setting and always DMA using low memory ( <16MB on i386) */ | |
212 | #define SG_SET_FORCE_LOW_DMA 0x2279 /* 0-> use adapter setting, 1-> force */ | |
213 | #define SG_GET_LOW_DMA 0x227a /* 0-> use all ram for dma; 1-> low dma ram */ | |
214 | ||
215 | /* When SG_SET_FORCE_PACK_ID set to 1, pack_id is input to read() which | |
216 | tries to fetch a packet with a matching pack_id, waits, or returns EAGAIN. | |
217 | If pack_id is -1 then read oldest waiting. When ...FORCE_PACK_ID set to 0 | |
218 | then pack_id ignored by read() and oldest readable fetched. */ | |
219 | #define SG_SET_FORCE_PACK_ID 0x227b | |
220 | #define SG_GET_PACK_ID 0x227c /* Yields oldest readable pack_id (or -1) */ | |
221 | ||
222 | #define SG_GET_NUM_WAITING 0x227d /* Number of commands awaiting read() */ | |
223 | ||
224 | /* Yields max scatter gather tablesize allowed by current host adapter */ | |
225 | #define SG_GET_SG_TABLESIZE 0x227F /* 0 implies can't do scatter gather */ | |
226 | ||
227 | #define SG_GET_VERSION_NUM 0x2282 /* Example: version 2.1.34 yields 20134 */ | |
228 | ||
229 | /* Returns -EBUSY if occupied. 3rd argument pointer to int (see next) */ | |
230 | #define SG_SCSI_RESET 0x2284 | |
26cf591e DG |
231 | /* Associated values that can be given to SG_SCSI_RESET follow. |
232 | * SG_SCSI_RESET_NO_ESCALATE may be OR-ed to the _DEVICE, _TARGET, _BUS | |
233 | * or _HOST reset value so only that action is attempted. */ | |
1da177e4 LT |
234 | #define SG_SCSI_RESET_NOTHING 0 |
235 | #define SG_SCSI_RESET_DEVICE 1 | |
236 | #define SG_SCSI_RESET_BUS 2 | |
237 | #define SG_SCSI_RESET_HOST 3 | |
39120e11 | 238 | #define SG_SCSI_RESET_TARGET 4 |
26cf591e | 239 | #define SG_SCSI_RESET_NO_ESCALATE 0x100 |
1da177e4 LT |
240 | |
241 | /* synchronous SCSI command ioctl, (only in version 3 interface) */ | |
242 | #define SG_IO 0x2285 /* similar effect as write() followed by read() */ | |
243 | ||
244 | #define SG_GET_REQUEST_TABLE 0x2286 /* yields table of active requests */ | |
245 | ||
246 | /* How to treat EINTR during SG_IO ioctl(), only in SG 3.x series */ | |
247 | #define SG_SET_KEEP_ORPHAN 0x2287 /* 1 -> hold for read(), 0 -> drop (def) */ | |
248 | #define SG_GET_KEEP_ORPHAN 0x2288 | |
249 | ||
250 | /* yields scsi midlevel's access_count for this SCSI device */ | |
251 | #define SG_GET_ACCESS_COUNT 0x2289 | |
252 | ||
253 | ||
6460e75a | 254 | #define SG_SCATTER_SZ (8 * 4096) |
1da177e4 | 255 | /* Largest size (in bytes) a single scatter-gather list element can have. |
6460e75a DG |
256 | The value used by the driver is 'max(SG_SCATTER_SZ, PAGE_SIZE)'. |
257 | This value should be a power of 2 (and may be rounded up internally). | |
258 | If scatter-gather is not supported by adapter then this value is the | |
259 | largest data block that can be read/written by a single scsi command. */ | |
1da177e4 LT |
260 | |
261 | #define SG_DEFAULT_RETRIES 0 | |
262 | ||
263 | /* Defaults, commented if they differ from original sg driver */ | |
1da177e4 LT |
264 | #define SG_DEF_FORCE_PACK_ID 0 |
265 | #define SG_DEF_KEEP_ORPHAN 0 | |
266 | #define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ /* load time option */ | |
267 | ||
268 | /* maximum outstanding requests, write() yields EDOM if exceeded */ | |
269 | #define SG_MAX_QUEUE 16 | |
270 | ||
271 | #define SG_BIG_BUFF SG_DEF_RESERVED_SIZE /* for backward compatibility */ | |
272 | ||
273 | /* Alternate style type names, "..._t" variants preferred */ | |
274 | typedef struct sg_io_hdr Sg_io_hdr; | |
275 | typedef struct sg_io_vec Sg_io_vec; | |
276 | typedef struct sg_scsi_id Sg_scsi_id; | |
277 | typedef struct sg_req_info Sg_req_info; | |
278 | ||
279 | ||
280 | /* vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv */ | |
281 | /* The older SG interface based on the 'sg_header' structure follows. */ | |
282 | /* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ */ | |
283 | ||
284 | #define SG_MAX_SENSE 16 /* this only applies to the sg_header interface */ | |
285 | ||
286 | struct sg_header | |
287 | { | |
288 | int pack_len; /* [o] reply_len (ie useless), ignored as input */ | |
289 | int reply_len; /* [i] max length of expected reply (inc. sg_header) */ | |
290 | int pack_id; /* [io] id number of packet (use ints >= 0) */ | |
291 | int result; /* [o] 0==ok, else (+ve) Unix errno (best ignored) */ | |
292 | unsigned int twelve_byte:1; | |
293 | /* [i] Force 12 byte command length for group 6 & 7 commands */ | |
294 | unsigned int target_status:5; /* [o] scsi status from target */ | |
295 | unsigned int host_status:8; /* [o] host status (see "DID" codes) */ | |
296 | unsigned int driver_status:8; /* [o] driver status+suggestion */ | |
297 | unsigned int other_flags:10; /* unused */ | |
298 | unsigned char sense_buffer[SG_MAX_SENSE]; /* [o] Output in 3 cases: | |
299 | when target_status is CHECK_CONDITION or | |
300 | when target_status is COMMAND_TERMINATED or | |
301 | when (driver_status & DRIVER_SENSE) is true. */ | |
302 | }; /* This structure is 36 bytes long on i386 */ | |
303 | ||
304 | ||
305 | /* IOCTLs: The following are not required (or ignored) when the sg_io_hdr_t | |
306 | interface is used. They are kept for backward compatibility with | |
307 | the original and version 2 drivers. */ | |
308 | ||
309 | #define SG_SET_TIMEOUT 0x2201 /* unit: jiffies (10ms on i386) */ | |
310 | #define SG_GET_TIMEOUT 0x2202 /* yield timeout as _return_ value */ | |
311 | ||
312 | /* Get/set command queuing state per fd (default is SG_DEF_COMMAND_Q. | |
313 | Each time a sg_io_hdr_t object is seen on this file descriptor, this | |
314 | command queuing flag is set on (overriding the previous setting). */ | |
315 | #define SG_GET_COMMAND_Q 0x2270 /* Yields 0 (queuing off) or 1 (on) */ | |
316 | #define SG_SET_COMMAND_Q 0x2271 /* Change queuing state with 0 or 1 */ | |
317 | ||
318 | /* Turn on/off error sense trace (1 and 0 respectively, default is off). | |
319 | Try using: "# cat /proc/scsi/sg/debug" instead in the v3 driver */ | |
320 | #define SG_SET_DEBUG 0x227e /* 0 -> turn off debug */ | |
321 | ||
322 | #define SG_NEXT_CMD_LEN 0x2283 /* override SCSI command length with given | |
323 | number on the next write() on this file descriptor */ | |
324 | ||
325 | ||
326 | /* Defaults, commented if they differ from original sg driver */ | |
327 | #ifdef __KERNEL__ | |
328 | #define SG_DEFAULT_TIMEOUT_USER (60*USER_HZ) /* HZ == 'jiffies in 1 second' */ | |
329 | #else | |
330 | #define SG_DEFAULT_TIMEOUT (60*HZ) /* HZ == 'jiffies in 1 second' */ | |
331 | #endif | |
332 | ||
333 | #define SG_DEF_COMMAND_Q 0 /* command queuing is always on when | |
334 | the new interface is used */ | |
335 | #define SG_DEF_UNDERRUN_FLAG 0 | |
336 | ||
337 | #endif |